class Car:
    """一次模拟汽车的简单尝试"""
    # 为属性指定默认值
    def __init__(self, make, model, year):
        """初始化描述汽车的属性"""
        self.make = make
        self.model = model
        self.year = year
        self.odometer_reading = 0
    def get_descriptive_name(self):
        """返回整洁的描述性信息"""
        long_name = f"{self.year} {self.make} {self.model}"
        return long_name.title()
    def read_odometer(self):
        """打印一条指出汽车里程的消息"""
        print(f"This car has {self.odometer_reading} miles on it.")
    def update_odometer(self, mileage):
        """将里程表读数设置为指定的值"""
        self.odometer_reading = mileage
    def increment_odometer(self, miles):
        """将里程表读数增加指定的量"""
        self.odometer_reading += miles

class Battery:
    """一次模拟电动汽车电瓶的简单尝试"""
    def __init__(self, battery_size=75):
        """初始化电瓶的属性"""
        self.battery_size = battery_size
    def describe_battery(self):
        """打印一条描述电瓶容量的消息"""
        print(f"This car has a {self.battery_size}-kWh battery.")
    def get_range(self):
        """<UNK>"""
        if self.battery_size == 75:
            range = 260
        elif self.battery_size == 100:
            range = 315
        print(f"This car can go about {range} miles on a full charge.")


class ElectricCar(Car):
    """电动汽车的独特之处"""
    def __init__(self, make, model, year):
        """初始化父类的属性"""
        super().__init__(make, model, year)
        self.battery = Battery()

if __name__ == "__main__":

    my_tesla = ElectricCar("tesla", "model s", 2019)
    print(my_tesla.get_descriptive_name())
    my_tesla.battery.describe_battery()
